From: Mel Gorman <mgorman@suse.de>
To: Fengguang Wu <fengguang.wu@intel.com>
Cc: LKML <linux-kernel@vger.kernel.org>, lkp@01.org
Subject: Re: [mm] f7b5d647946: -3.0% dbench.throughput-MB/sec
Date: Tue, 19 Aug 2014 15:34:28 +0100 [thread overview]
Message-ID: <20140819143428.GC10146@suse.de> (raw)
In-Reply-To: <20140819044134.GB8798@localhost>
On Tue, Aug 19, 2014 at 12:41:34PM +0800, Fengguang Wu wrote:
> Hi Mel,
>
> We noticed a minor dbench throughput regression on commit
> f7b5d647946aae1647bf5cd26c16b3a793c1ac49 ("mm: page_alloc: abort fair
> zone allocation policy when remotes nodes are encountered").
>
> testcase: ivb44/dbench/100%
>
> bb0b6dffa2ccfbd f7b5d647946aae1647bf5cd26
> --------------- -------------------------
> 25692 ± 0% -3.0% 24913 ± 0% dbench.throughput-MB/sec
> 6974259 ± 6% -12.1% 6127616 ± 0% meminfo.DirectMap2M
> 18.43 ± 0% -4.6% 17.59 ± 0% turbostat.RAM_W
> 9302 ± 0% -3.6% 8965 ± 1% time.user_time
> 1425791 ± 1% -2.0% 1396598 ± 0% time.involuntary_context_switches
>
> Disclaimer:
> Results have been estimated based on internal Intel analysis and are provided
> for informational purposes only. Any difference in system hardware or software
> design or configuration may affect actual performance.
>
DirectMap2M changing is a major surprise and doesn't make sense for this
machine. Did the amount of memory in the machine change between two
tests?
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2014-08-19 14:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-19 4:41 [mm] f7b5d647946: -3.0% dbench.throughput-MB/sec Fengguang Wu
2014-08-19 14:34 ` Mel Gorman [this message]
2014-08-19 15:43 ` Fengguang Wu
2014-08-19 16:12 ` Mel Gorman
2014-08-19 17:36 ` Fengguang Wu
2014-08-19 19:11 ` Mel Gorman
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